This list is as complete, and as accurate, as we can make it at present. We hope to add to it as we go along, and gradually to fill in most of the remaining blanks, by one means or another. But it is not an exact science. To quote a minister for Defence in another war:

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don’t know. But there are also unknown unknowns. There are things we don’t know we don’t know.